乘用车排气系统内流场分析毕业论文论文报告.docVIP

河 北 工 业 大 学 毕业设计说明书(论文) 作 者： 耿玉伟 学 号： 100259 学 院： 机械工程学院 系(专业)： 车辆工程 题 目： 乘用车排气系统内流场分析 指导者： 刘璇 讲师 (姓 名) (专业技术职务) 评阅者： (姓 名) (专业技术职务) 2014年5月24日 毕业设计（论文）中文摘要 题 目 乘用车排气系统内流场分析 摘要: 汽车的销量随着人们生活水平的不断提高,以及当前工业化发展不断进步而迅速增长。但是越来越多的汽车给社会带来很多问题，如空气污染问题、噪声污染问题、能源消耗问题等等。汽车排气系统，是汽车上非常重要的部位，不仅能控制尾气污染,还会可以降低排气噪声，而且对汽车动力性和经济性都会产生影响,所以它的设计好坏至关重要。传统的设计方法既浪费时间又得不到什么较好的结果,而且理论分析方法计算对象太过于抽象化和简化，有时也是非常难甚至不会得到解析解，但是CFD克服了这些弱点，在排气系统的优化设计及改进方案中提供了很多可行的方案。 本文在查阅大量资料的基础上论述了排气系统的发展现状。然后对排气系统内流场进行了建模、模拟计算，并通过对它们流场中的一些数值模拟进行了流体分析，对排气系统的优化设计提出个合理的方案。 关键词：排气系统；内流场；流体分析 毕业设计（论文）外文摘要 Title The flow field analysis of passenger car exhaust system Abstract: Car sales with the continuous improvement of living standards, as well as the current industrialization development progress and rapid growth. But more and more cars bring many problems to society, such as air pollution, noise pollution, energy consumption etc.. Automobile exhaust system, is a very important part of the car, can not only control the tail gas pollution, but also can reduce the exhaust noise, but also will have an impact on the dynamic performance and fuel economy, so it is crucial to its design quality. The traditional design method is not only a waste of time and not what good results, and the theoretical analysis method to calculate the object is too abstract and simplified, and sometimes very difficult will not even get analytic solution, but CFD overcome these weaknesses, in the improved scheme and optimize the design of the exhaust system provides many feasible schemes. We first briefly introduce the development status of automobile exhaust system, and then introduces the application and the Solidworks software. Then the flow field in the exhaust system of computational modeling, simulation, and through the analysis of some numerical fluid flow simulati